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Ammonia as Nitrogen. ALS Environmental may or may not test for Ammonia as Nitrogen (CAS # 7664-41-7). Information is subject to change; please contact us for the latest available analytes for which we test.
There has been an exponential growth in the number of substances indexed by CAS, with the number doubling between 2009 and 2015 as shown in this graph: Key point: CAS numbers identify the chemical, but not its concentration or specific mixture. For example, hydrogen chloride (HCl) has the CAS number 7647-01-0. That CAS number will appear on containers of anhydrous hydrogen chloride, a 20% solution of HCl in water, and a 2.0 molar solution of HCl in diethyl ether. The numbers you see on trucks on the highway are not CAS Numbers, but U.S. Department of Transportation (DOT) mandated UN/NA codes which are not necessarily specific to each chemical.